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Interval package

225 bytes added, 12:09, 14 October 2014
Arithmetic operations: added examples
One operation that should be noted is the <code>fma</code> function (fused multiply and add). It computes '''''x''''' * '''''y''''' + '''''z''''' in a single step and is much slower than multiplication followed by addition. However, it is more accurate and therefore preferred in some situations.
 
octave:1> sin (infsup (0.5))
ans = [.47942553860420294, .47942553860420307]
octave:2> pow (infsup (2), infsup (3, 4))
ans = [8, 16]
octave:3> atan2 (infsup (1), infsup (1))
ans = [.7853981633974482, .7853981633974484]
=== Reverse arithmetic operations ===
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